Two riders.
One trainer.
One Zwift subscription.

It is one of the most common setups in indoor cycling, and one of the most quietly annoying. There is one smart trainer in the spare room. One of you rides it constantly and pays for Zwift. The other would happily do two or three easy hours a week on it — and is told that will be another £179.99 a year.

This page is about that second rider. What Zwift actually allows, what a second membership costs, and the much cheaper option if all they want is a steady aerobic ride.

Can two people share one Zwift account?

Not in any way you would want to live with. Zwift is one account per rider, and that is a deliberate design rather than an oversight:

• You cannot both be logged in and riding at once. The account supports a single active session.
• Sharing one profile means editing weight, height and FTP before every single ride. Forget once and the power numbers are meaningless.
• Both riders' data lands in the same history. Your fitness trend, your personal bests and your achievements are now an average of two different people.
• There is no household or family plan. A second rider needs a second full membership.

So the real question is not whether you can share the account. It is whether the second rider needs Zwift at all.

What the second membership actually costs

As of September 2026, a UK Zwift membership is £17.99 a month, or £179.99 a year. There is no discount for a second rider in the same house.

There also isn't a free way in any more. Zwift used to offer 25 km a month free, which was enough for an occasional rider to get by on. That was withdrawn in August 2025. What remains is a 14-day trial for brand-new accounts, after which riding requires a paid membership.

For a partner who wants two easy hours a week, £179.99 a year works out at roughly £1.70 per ride — for a virtual world they are not especially interested in.

The second rider usually wants something much simpler

This is the part worth being honest about. Plenty of people genuinely want what Zwift sells: the worlds, the group rides, the racing, the structured plans, the social side. If that is the second rider, they should buy the membership. It is a good product and nothing here replaces it.

But very often the second rider wants something far narrower:

• A steady, easy hour that builds aerobic fitness without wrecking the rest of the week.
• To not have to think about it — no route to pick, no workout to load, no avatar to dress.
• To have it land in Strava afterwards with sensible numbers.
• To stop drifting too hard. The classic beginner mistake is riding the easy days at medium effort.

That is Zone 2 training, and it does not need a games engine. It needs something that watches your heart rate and adjusts the trainer so you stay in the right band.

What Justzone2 does instead

Justzone2 is a deliberately small iOS app that does exactly that one job. You connect the same smart trainer, set an hour, and start pedalling. A PID controller reads your heart rate every second and nudges the trainer's resistance up or down to hold you in Zone 2 for the whole session — so the ride self-corrects as you warm up, fatigue, or get too comfortable.

• £1.99, once. No subscription, no account to create, no email required.
• Works with the same trainer. Any FTMS trainer, including the whole Wahoo KICKR range.
• Heart rate from what you own — Apple Watch, a Bluetooth chest strap, an optical arm band, or AirPods Pro 3.
• Uploads to Strava with power, heart rate, cadence, distance and calories.
• One purchase covers the household. Apple Family Sharing covers up to six family members, each with their own zones and their own Strava account.

What it is not

It is worth being blunt, because buying the wrong thing is worse than spending £179.99 on the right one. Justzone2 has no virtual worlds, no avatars, no racing, no group rides and no training-plan library. There is nothing to look at but your numbers. If the second rider wants company, scenery or competition, this is the wrong app and Zwift is the right one.

It also assumes an iPhone and a heart-rate source. Without a heart-rate signal there is nothing for the controller to target.

How it works day to day

You were never going to ride at the same time anyway — there is one trainer. So the two apps simply take turns:

• Rider one finishes their Zwift session and closes it, which releases the trainer.
• Rider two opens Justzone2 on their own iPhone and connects to the same trainer over Bluetooth.
• Nothing is installed on the trainer and none of its settings are changed, so neither setup disturbs the other.

Two riders, two sets of heart-rate zones, two Strava accounts, one trainer, one subscription.

Common questions

If that sounds like your spare room

One rider keeps Zwift. The other gets an app that costs less than a coffee and does the one thing they actually wanted — and because it is covered by Family Sharing, that is £1.99 once for the whole household, not per rider and not per year. If you want the reasoning behind why the easy hour is worth protecting, the evidence review goes through what the research does and doesn't support, and Getting Started walks through a first ride.

Zwift is a trademark of Zwift, Inc. Justzone2 is not affiliated with, endorsed by or connected to Zwift. Membership prices quoted are Zwift's UK list prices as published in September 2026 and may change.